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Sensitivity: Proportion of those people who have the disease who are correctly detected by the test.

Specificity: Proportion of those people who do not have the disease who are correctly left undetected by the test.

Negative Predictive value: Proportion of those testing negative who are truly disease free.

Positive Predicative Value: Proportion of those testing positive who truly have the disease.

Diagnostic test: Test offered to people who have a specific indication of possible illness (a history, symptom, sign or screening test result) to determine whether or not they have the disease in question.

Screening test: Test offered to asymptomatic people who may or may not have early disease or disease precursor and are sued to guide whether or not a diagnostic test should be offered.

Parallel testing: screening tests performed at the same time and the results are subsequently combined.

Serial testing: Second screening test is performed only if the result of the first screening test is positive.

True positive test result: A person with the condition tested for, and a positive test result.

False positive test result: A person without the condition tested for, and a positive test result.

True negative test result: A person without the condition tested for, and a negative test result.

False negative test result: A person with the condition tested for, and a negative test result.

Inter-rater reliability: is the degree of agreement among raters of the result of a diagnostic test. If there is significant disagreement of a test outcome between raters, either the scale is defective or better training needs to be provided for those who use the test.

Test-retest reliability. Is used to determine a test's reliability. A diagnostic test on the same person in short succession should provide the same test result. However, the same test result on the same person over a long period may result from a test's inability to detect subtle changes.